01/02/2019 – Unicofil PLA Rainbow review


DHL delivered a package a couple of days ago. what could this be? A surprise from Unicofil !

Unicofil is a German company, specialised in rainbow filament. I’ve got 4 coils to play with.

The boxes are sober, clean with a label on it. That’s all you see. This is weakness, if you ask me. There is no mentioning of the brand on the label. If you store these boxes in your stash, after some time it is difficult to know what the brand was, if you didn’t write the name on the box yourself.

An opened box doesn’t make you much smarter. So if you opened the sealed bag, you can have made the wrong choice. En as we know, an opened packaga of filament, becomes a risk to absorb water. Then this is obvious that you make the risk for decreasing print quality bigger, the longer the package is opened and not completely used. I’ve sended the company a note with this remark, asking them to make the label more complete with all information written on it.

The coils contain 750 gram filament. The reel is clear plastic, so you can estimate how much filament is left over on the spool. I say estimate, yes. The lack of indication/estimation is a pity. More and more companys now make some kind of indication on the spool. The windings of the filament are decent. In the closed package is a bag of silicate included to avoid the filament to absorb moisture.

As usual I measured the diameter over 5 meters and 10 measuring points. The average diameter was calculated from those 10 results to put into the slicer. My average here was 1.74, minmu 2 times 1.73 and all the rest 1.74. That is pretty constant.

Tha manufacturer advises to print on a heated bed between 40 – 60° C. In theory, this should be printable on a cold bed, since this is PLA. Nozzle temperature should be between 210 and 230° C.

My first test is always a temperature tower with 0.2 mm layers.

The best temperature on my Prusa MK2s was 205°C. Very little stringing, which is always nice. (edit: further tests did me conclude the temp should be raised a bit: 210°C)

My calibration cube was next to print. Testing temperature: 205° C., layers 0.2 .No supports! Always a difficult piece to print, especially the underside, since the spheres are becoming more and more horizontal and there are no supports present when printed. Except for the errors we see on all filaments, I was more then happy with the result.

Top: perfect!
side: next prints should be a bit hotter (210 °C)
bottom: the normal error, since this was printed without supports.

To finish my regular tests, I printed the owls again. No supports! Layers 0.15 mm. This print made me realise again dat the 205° C I’ve set before, was a bit on the low side. An extra 5, maybe 10° should do better When testing the next spool, I will keep this in mind.

Time to print some leftovers of the spool.


  • temperature should be a little warmer then normal for PLA. 210 should be better then the 205 I’ve tested this with.
  • The material is strong, doesn’t break easy.
  • The PLA is not brittle at all.
  • Almost NO stringing.
  • I do miss some markings on the side of the coil to estimate the leftover.

You can print colorfull effects on a printer that only has 1 extruder, without much hassle. I love this result so far.

To be continued….

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