BigMac MKII - Geeetech A20M / A10M cyclop hotend adapter
Description
NOTICE: I try to design and publish things that can be useful to you too. If you feel this MOD may be useful for you, please consider a little donation in my favor. This will help me to create new things for you and for the whole community, Thank you! https://www.paypal.me/RobertoMacchi INTRODUCTION The Geeetech A20M and A10M 3D printers are real must-haves among enthusiasts and today offer the best possible features in a truly economical printer, affordable for everyone. However, among their many positive features, there is one that does not meet my consent and this is the type of hotend installed in stock. This hotend collects the filament from the two upper Titan clone extruders and pushes them towards an unlikely mixing chamber located just below the heatsinks and transition grooves of the hotend. The great problem of this solution is first of all represented by the same technique of mixing two different filaments, very difficult to obtain with good results because of the exercise against nature to which the components that must perform this task are subjected: the great forces involved and the difficulty of sliding on two filaments that almost have to clash and then come out fused together by the nozzle will never ensure the fluidity of operation necessary to make a print reliable. Secondly, but no less important, it is the wrong way in which Geeetech has tried to solve the problem, designing a hotend that forces the filaments to make a double angle at 90 degrees in a few millimeters of space. The result of all this is an impressive series of clogging and difficulty in molding even with a single strand involved. So I wanted to eliminate the mixing function and design and build my BigMac adapter designed around the new and innovative cyclopic hotend sold recently by GearBest at a fairly inexpensive price which I provide the link on this same page. BigMac is a high-ventilation adapter with recirculation and two-way air vent designed to always preserve the proper cooling of the heated body and maintain a solid joint between the new cyclop two-in-one hotend distributed by GearBest. You can see BigMac in action on my Geeetech A20M here: https://youtu.be/2j9ECvdpPt8 The new hotend allows dual color printing with a little purge tower and provides impressive regularity of operation, finally allowing A20M and A10M users a correct approach to the so-called technical materials such as PETG, ABS, ASA, HIPS, PBT, PC and POM . I have tested this adapter for a long time before making it available to all of you and today its MKII version I believe can definitely solve all your problems of clogging and unwanted interruptions of the press that you have always suffered so far. The installation of this component is very simple and the adoption of two twin 40x40x10 sandwich-mounted fans (hence the name BigMac) one for cooling the hotend and the other for cooling the molten material, exploit the same connectors present on the small PBT present on these two printers. Once installed, all you need to do is simply inform your favorite slicer software to retract the first strand 60 mm before advancing the second every time you request a color change. This hotend uses a minimal amount of filament for purging and your towers can be really small, with a paltry amount of material wasted on this operation. The great advantage of this MOD will be to finally be able to use A20M and A10M as two-color or single-color multipurpose printers even with technical materials that are difficult to print without the impediments deriving from the use of a wrong stock hotend in the design and which compromised with its continuous clogging any type of printing even in single color. The new GearBest hotend used by BigMac is also easily maintainable with its only two easy-to-reach screws that, once unscrewed, give full access to the group, with a clear view of the two grooves and the nozzle, with light and no longer as blind as in the original hotend. For the realization of BigMac you will need, in addition to printing the three STL files, the following small parts: n. 2 screws 3ma x 10mm n. 8 screws 3ma x 20mm n. 2 screws 3ma x 15mm n.10 nuts 3ma Obviously the BigMac printing must be done using a good PETG filament (I suggest PETG-Tech by FFF WORLD) or ABS (AmazonBasics in this case will be fine). This is the link to buy the new hotend from GearBest: https://it.gearbest.com/3d-printer-parts/pp_009834258418.html?wid=1433363 Good prints at all!
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