BigMac MKII - Geeetech A20M / A10M cyclop hotend adapter

thingiverse

NOTICE: I strive to design and publish content that can be beneficial to you as well. If you find this MOD useful, please consider a small donation in my favor. This will enable me to create new things for you and the entire community, Thank you! https://www.paypal.me/RobertoMacchi INTRODUCTION The Geeetech A20M and A10M 3D printers are must-haves among enthusiasts today, offering the best possible features in an affordable printer that is accessible to everyone. However, one feature does not meet my approval - the type of hotend installed in stock. This hotend collects filament from two upper Titan clone extruders and pushes it towards a mixing chamber located below the heatsinks and transition grooves of the hotend. The problem with this solution lies in the technique of mixing two different filaments, which is difficult to achieve with good results due to the forces involved and the difficulty of sliding on two filaments that must clash and come out fused together through the nozzle. Secondly, but no less important, is the wrong approach taken by Geeetech in designing a hotend that forces the filaments to make a double angle at 90 degrees in a few millimeters of space. The result of 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 my BigMac adapter around the new cyclopic hotend sold by GearBest at a relatively 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 to approach technical materials such as PETG, ABS, ASA, HIPS, PBT, PC, and POM correctly. I have tested this adapter for a long time before making it available to all of you, and today its MKII version can definitely solve all your problems of clogging and unwanted interruptions of the press that you have always suffered. 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 exploits 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, which compromised 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, 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!