Switching DTF ink or film without wrecking a printhead: never mix inks, flush first, then test with a nozzle check, color chart, white on black, wash and peel tests.
Switching DTF ink or film is one of the few supply decisions that can take a printer down if it is done carelessly, and one of the easiest ways to cut cost and improve output if it is done with a plan. The risk is in the lines: two inks with different dispersant chemistry can gel and clog an i3200 head that was printing fine an hour earlier. The reward is a white that covers in one pass, a film that peels the same on every roll, and wholesale pricing without a minimum. Here is how to test new DTF film and ink the way careful shops do it, from flush to wash test, using a single roll and a single bottle from our DTF supplies stock in Miami.
Rule one when switching DTF ink: never mix inks in the lines
DTF pigment inks look alike and behave differently. Each manufacturer balances pigment, dispersant, humectant and co solvents to its own recipe. Mix two recipes in a damper or a line and the dispersants can fight, the pigment can fall out of suspension, and what was two good inks becomes a sludge that settles in the smallest passages of the head.
So: do not top up a half full cartridge or bulk tank with a new ink, and do not run one color from the new supplier and four from the old on the same head. Switch one color at a time if you must, always with a flush between.
White deserves extra caution because it carries the heaviest pigment load and the most dispersant. Switch a CMYK color first, learn how the ink behaves, then switch white.
Flushing in general terms
Printer makers and ink makers publish their own procedures, so follow the one for your machine. In general terms the sequence is:
- Print a nozzle check and photograph it so you have a baseline of the head in its current state.
- Drain or remove the old ink from cartridges or bulk tanks for the colors you are changing.
- Load cleaning solution and run it through the lines, dampers and head until what comes out of the waste line is clear. Some operators let cleaning fluid sit in the head for a few hours to dissolve old residue.
- Drain the cleaning solution, load the new ink and charge the lines until the new color reaches the head with no streaks of cleaner or old ink.
- Print a nozzle check. Compare it to your baseline.
Budget half a day for a full five color flush on a single head machine, and check dampers while the system is empty; a discolored damper is cheap to replace now and expensive to diagnose later. For the maintenance routine that follows, see DTF ink clogging and printhead maintenance.
How to test new DTF film and ink: the protocol
Print the same files, press on the same blanks, and write down the numbers. Five tests cover almost everything that matters.
1. Nozzle check, day one and day three
Print a nozzle check immediately after charging, then at the start of each of the next three days before any cleaning. A good ink keeps the pattern complete overnight with only normal agitation of the white. Dropouts that return every morning point to settling.
2. Color chart
Print a swatch chart with solid primaries, secondaries, 25, 50 and 75 percent tints, skin tones and a grey ramp. Press it on white cotton. Compare against the same chart printed with your previous ink. Look for hue shifts in red and green, muddiness in the greys and how fine text at 6 point holds its edge. Expect to re profile the RIP; the chart tells you how far off you are.
3. White density on black
Print a solid white square and a white fine line test, powder, cure and press on a black cotton tee. Hold it to a window. A dense white hides the black with the RIP set to a single underbase layer. If you need two layers to get there, that is twice the white ink per print and a thicker, stiffer transfer. The pigment ink we stock is formulated for i3200 heads with a white dense enough to cover black garments in one pass, and this test is how you confirm that on your own press. More on reading the result in our white ink guide.
4. Wash test
Press the color chart and the white square on two tees. Wash one five times on warm, tumble dry, and compare it against the unwashed one. Look for cracking at the edges, lifted corners, fading in the reds and any pink haze (dye migration) if the blank was polyester. The real failures show in the first two washes.
5. Peel test
Film is tested at the peel. Run the new roll through your normal powder and cure, then press and peel ten transfers at your standard settings. Note whether every one releases cleanly with no ink left on the film, whether hot peel film actually peels hot, and whether the film curls or sticks in the printer. Our film peel problems guide lists what each symptom means.
Test with one roll and one bottle
You do not need to commit a month of supply to a trial. Because we sell with no minimum order, a shop can buy one 100 m roll of film in its width and peel type and one 1 kg bottle of the color it wants to test, run the full protocol above, and decide. Current pricing is on the product page; at the time of writing a roll of PET film is $85 in every width and type, and a 1 kg bottle of ink is $50 by the color.
A sensible first trial for a single head shop:
- One roll of film in your current width and peel type, so the only variable is the film.
- One bottle of cyan or magenta if you want to try ink with the least risk, or one bottle of white if white coverage is the problem you are trying to solve.
- One 1 kg bag of Medium Fine hot melt powder if you also want to compare powder, tested separately so you can attribute results.
Change one thing at a time. Switch film, ink and powder in the same week and you will not know which to blame when a corner lifts.
What to compare, side by side
| Measure | How to check | Pass looks like |
|---|---|---|
| Nozzle health | Nozzle check at start of day, three days running | Complete pattern or cleared by one standard clean |
| White opacity | Solid white square on black cotton, one underbase layer | No black visible against a window |
| Color accuracy | Swatch chart vs previous ink, same RIP settings | Shifts small enough to profile out |
| Fine detail | 6 point text and 0.5 mm lines | Sharp edges, no feathering into clear film |
| Powder release | Shake off excess after powdering | No powder sticking to unprinted film |
| Peel | Ten transfers at standard settings | Clean release every time, matched to the peel type |
| Wash durability | Five warm washes | No cracking, lifting or color loss |
| Hand | Finger test after second press | Soft, flexible, no plastic feel |
| Ink use per print | RIP ink estimate for the same file | Equal or lower, especially white |
Document the results
Write everything down. A page in a notebook or a shared spreadsheet is enough. Record:
- Date, printer, head count and RIP version.
- Product tested, lot number from the bottle or roll, and the date it was opened.
- Printer settings: resolution, passes, white layer count, ink limits.
- Powder grade, cure method, cure temperature and time.
- Press temperature, time, pressure and peel method.
- Photos of the nozzle checks, color chart and the washed tee next to the unwashed one.
- Any cleaning cycles needed and when.
Keep the pressed test tees in a drawer with the date inside the collar. When a customer asks why a print looks different from last year, you will have an answer instead of a guess.
Why shops switch, and what they switch to
The shops we supply usually switch for one of four reasons: white that needs two passes to cover, a head that clogs every weekend, film that peels differently roll to roll, or a supplier that requires a case minimum when they only need a bottle. The protocol above answers the first three. The fourth is answered by how we sell.
Every item in our DTF range is in stock in Miami, Florida and sold by the single unit: ink by the color so a shop can restock white alone, film by the roll in 30, 33, 42 and 60 cm and every peel type, powder from 1 kg up to 20 kg. Orders ship worldwide with tracked USPS shipping, and anything that arrives damaged or defective is replaced once you email photos the day it lands. Once the trial passes, the same consumables are there for the weekly reorder at the same wholesale pricing; see wholesale DTF supplies with no minimum order for how shops structure that. The full range is on the DTF supplies page.
Frequently asked questions
Can I mix DTF ink from two different brands?
No. Different DTF pigment inks use different dispersant chemistry, and mixing them in a cartridge, line or damper can cause the pigment to fall out of suspension and clog the i3200 head. Drain the old ink, flush with cleaning solution until it runs clear, then charge the new ink.
How do I flush a DTF printer when switching DTF ink?
Follow your printer maker's procedure. In general terms: baseline nozzle check, drain the old ink, run cleaning solution through the lines and head until the waste runs clear, drain the cleaner, charge the new ink, and print another nozzle check.
How do I test new DTF film before switching?
Buy one roll in your current width and peel type so the film is the only variable. Print, powder and cure as normal, then press and peel ten transfers at your standard settings. Every one should release cleanly with no ink left on the film, and your settings should not need to change.
How much DTF ink should I buy to test a new supplier?
One 1 kg bottle is enough to run a nozzle check series, a color chart, a white density test and a wash test. Because we sell with no minimum order, a shop can trial one bottle of one color at $50 and one roll of film at $85 before committing a month of supply.
What should I compare when switching DTF ink suppliers?
Nozzle health over three days, white opacity on black cotton at a single underbase layer, color accuracy against your previous chart, fine detail at 6 point text, powder release, peel behavior, five wash durability, hand feel and the RIP ink estimate for the same file.
Test one roll and one bottle before you switch
No minimum order means a trial costs one roll of film and one bottle of ink, both in stock in Miami at wholesale pricing with tracked worldwide shipping, replaced if they arrive damaged. Tell us your printer, head count and the problem you are trying to fix by text or call at (954) 280 0627 and we will suggest what to test first.
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