RostockMaxEvolution

SeeMeCNC has made lots of changes to the kit since it started shipping in late 2012. These are some of the changes, listed chronologically in each section.

Hot End
The hot end nozzle has seen three different versions, pictures to come.

Extruder

 * Steve's Extruder
 * Gear drive (capable of generating more torque than an un-geared extruder)
 * Fixed pinch rollers provide more holding friction than EZ-Struder
 * More torque and holding friction mean it can overpower blocked PLA sometimes, although it's better to troubleshoot the hot end and filament in that scenario; it's powerful enough to destroy a PTF connector if the filament is too jammed to move at all
 * Plays a symphony when it's working
 * Jams easily if you look at it sideways.
 * Kind of a pain to unjam.
 * Higher steps/MM (i.e., resolution) than EZ-Struder


 * EZ-Struder
 * Simpler, smaller, quieter
 * No geared transmission (unfortunately, no torque multiplication either)
 * Works with either Bowden, or direct-drive with a J-head, by rotating the bottom (that means it can be used with some printers other than the Rostock series)
 * Spring-loaded pinch roller allows VERY easy filament loading (way better than Steve's)
 * Mounted from the top instead of from the side, so the Bowden tube can be a lot shorter (and therefore, provide better retraction)
 * Less holding force than Steve's, but enough for filament that isn't jammed; will skip with a loud "thunk" and may chew up filament if the hot end is blocked; less likely to destroy PTF connectors in that scenario (but it will eventually if you don't solve the problem)
 * Lower steps/MM (i.e., resolution) than Steve's Extruder
 * Hobbed bolt may need to have filament dust and slivers removed periodically - this is easily done by removing the cover

Filament Holder

 * first one hangs off the side
 * new one sits on top.

RAMBo

 * Version 1.0
 * 1/8 microstepping
 * Version 1.1 and up
 * 1/16 microstepping

Belt Drive Sprockets

 * Machined aluminum 15-tooth
 * Rough edges on teeth can wear belts rapidly.
 * Aluminum hub, plastic teeth, 20-tooth
 * Several reports of plastic part cracking
 * Machined aluminum 20-tooth
 * I have no experience with these, how are they?

Arms

 * Original Arms
 * Glass-filled nylon injection molded, these need sanding to fit well.
 * Machined Arms
 * Holes and inside of arm ends are machined to fit better
 * Redesigned Arms
 * Offset fingers to make them easier to install and remove.
 * Wider center section to reduce flex.