AMS Anti-Jump-System

When addressing the issue of nearly empty, bouncing spools within the AMS, an additional weight is almost invariably recommended Consequently, countless spool weights can be discovered on Makerworld However, the fundamental problem remains largely unaddressed, as the roller inherently possesses an excessive degree of freedom in such instances

I located a model on Makerworld that employs a spring-loaded mechanism to press down on the rollers instead of utilizing spool weights This concept is splendid in itself, particularly as it necessitates no modifications to the AMS unit However, I anticipate that replacing spools could prove somewhat challenging, especially when the AMS is positioned at an elevated height, obscuring a direct view of the mechanism

Consequently, I surmised that incorporating a third roller within the lid would present the most efficacious solution This roller effectively impedes the spool from lifting, thereby obviating the need for any weights or activation mechanisms on the spools themselves Indeed, modifying the AMS lid is required, yet this is remarkably straightforward with the aid of the provided template Position the template on the exterior of the lid, then mark the recess and hole locations Drill the holes from the outside using a 3mm drill bit, then countersink them from the inside with a small countersink tool I sawed the recess with a multi-tool and then refined it slightly with a file The entire modification process, including the removal of the lid, consumed merely 15 minutes

Regarding its construction, two bearing-mounted rollers are situated on a single axle Between these rollers, a bearing point is positioned, which allows for free movement within the housing in the direction of the spool, yet is guided perpendicularly by the housing A small spacer can be secured within the lid using magnets EPDM foam pieces can then be affixed to this spacer The preload force exerted upon the spool can be adjusted by varying the thickness of the spacer and the thickness and quantity of the self-adhesive EPDM foam pieces

I had genuinely anticipated that following the challenges encountered with the AMS1, Bambu Lab would integrate such a spring-loaded system into the lid of the AMS2

For the construction of a hold-down mechanism, the following components are required:

• 6x RUTHEX M3x7 heat-set inserts
• 6x DIN7991 M3x10 countersunk screws
• 4x 686 ball bearings
• 1x DIN931 M6x70 hex head screw (or an M6 threaded rod)
• 1x DIN934 or DIN985 M6 hex nuts
• 8x 3.5x25 wood screws
• 2x Ø6x3 magnets
• self-adhesive EPDM foam (e.g., 2mm)