Filaments

PLA(PLA) filament is yourcommonly safestrecommended for its ease of use, safety, and easiestversatility. choice.PLA Itadheres prints easily, onto virtually any surface, and doesn't require any enclosure. It boasts OK impact resistance (you never know when your stroker decideswell to throw itself onto a neighbouringvariety object),of butsurfaces when it breaks, it snaps.

Adding to its flaws, itand does not likenecessitate heat,an andenclosure servomotorsfor caneffective produceprinting. quiteIt aoffers bitmoderate ofimpact resistance, an important consideration given the potential for mechanical interactions. However, PLA has limitations in heat when operating. PLA startsresistance, softening aroundat approximately 50°C (122°F), and deforms startingdeforming at temperatures around 60°C (140°F). While yourstandard servosoperational shouldn'ttemperatures beof ableservomotors togenerally reachremain 60°C,below especiallythese ifthresholds, youawareness addof athese fan, itproperties is always better to know in advance.advisable.

PETGPolyethylene Terephthalate Glycol (PETG) may might bepresent a better-suitedmore plasticsuitable alternative for thiscertain applicationapplications. than PLA is. WhileThough its impact resistance is lower,lower itthan doesn'tPLA, breakPETG asis easilyless prone to brittle failure and yieldsexhibits quitemore a bitelasticity before breaking. ItNotably, isPETG amaintains moreits flexiblestructural typeintegrity until reaching temperatures of plastic.
PETG also doesn't budge before hittingabout 80°C (176°F), whicha nothreshold servomotorunlikely shouldto hitbe surpassed under ourtypical conditions.

MakeAcrylonitrile sureButadiene toStyrene clear(ABS) theis pathanother offilament theoption, strokerknown duringfor operation,its robust mechanical and PETGthermal shouldproperties. beHowever, perfectlyprinting finewith forABS theserequires needs.

ABSequipment, issuch overkill. Not only do you requireas a 3D printer with an actively-actively heated chamber toand printminimal it,air drafts. Additionally, ABS printing can release harmful gases, necessitating proper safety precautions. For users seeking ABS-like properties without the associated printing requirements, Acrylonitrile Styrene Acrylate (ASA) may be a viable alternative.

Other filament types, such as PET, Polycarbonate (PC), or Polyethylene Terephthalate Glycol Copolymer (PCTG), are less commonly used. Flexible filaments such as Thermoplastic Elastomers (TPE) and asThermoplastic littlePolyurethane drafts(TPU) may be used for specific components, such as possible,gaskets, but it is also harmful to your health to print, due to the amount of degasing happening during printing. It is not a bad choice of material if you are able to print it safely, but its mechanical and thermal properties are not neededgenerally here. If you truly want the properties of ABS but don't have a printer capable of printing it, ASA might be the solution.

Those are the three most common types of 3D printer filament on the market, and should all run you the same price per kilogram. More exotic filament, like PET, PC or PCTG are out of the scope of this page.

Flexible filaments, such as TPE and TPU are not needed for this, unless you want to print the 6mm gasketsrequired for the OSR2 yourself.

Print settings

All parts can be printed coarse, at 0.2mm layer height. 

2 walls is a minimum, with 3 walls being recommended, as well as 30+% infill. For parts that need to be strong, such as the arms, it is a good idea to add a 4th wall and bump up the infill to 40% or more.

Line width should match your printer's nozzle's, typically, 0.4mm.

For temperaturemajority of the nozzle and bed, as well as the fan speed, follow the manufacturer's recommendations.parts.