Masherbrum (K1) - Release 1 - Beta 1

Changes from Alpha 6:

• Add Ascender Variant Top Plate for XY Carriage
• Fix issue where Full X travel could not be met, close to X0
• Drop NEMA23 support, internal testing has deemed it to be extremely overkill
• Add Stiffening Rods to the Top Plates on the XY Carriage, reduces tool wobble
• Revise the Z endstop, brush is now height adjustable
• Drop Duet3 Support, RRF3 is not stable enough as of current to recommend
• Add experimental 16t XY drive/idler pulley support

Masherbrum (K1) - Release 1 - Alpha 6

Changes from Alpha 5

• Even lighter toolhead, now reinforced by carbon fiber 5mm shafting
• Relocate electronics to rear
• Most of frame members have changed
• Most of the panels have changed
• Gantry to 4040 members
• Bed support rails to 2040
• Z travel has been reduced by 20mm in the interest of greatly increasing gantry rigidity and reducing chance of deformation on any crashing

note: re-released on 05-08-2020 to actually include correct DXFs of panels

Masherbrum (K1) - Release 1 - Alpha 5

Changes from Alpha 4

• refactor XY towers to strengthen, reduce material usage, use less lengths of fasteners, and allow easier servicing of idlers and motors.
• refactor Z towers to allow easier replacement of Z motors and strengthen overall assembly
• solidify XY tensioner/rail mount top cap, add washers to reduce chance of plastic deformation and creep
• refactor XY rail holder, tighten tolerances and add stress relief features
• refactor XY carriage: lighten by 100g, deck plate per extruder option, alter part cooling ducts for 10% more performance (per FEA) allowing better PLA cooling support
• temporarily remove support for ascender, it will return with further testing
• Duet3 is no longer supported, the software is too broken to recommend support at this time
• Z ballscrew/rail blocks now use through bolts instead of heat set inserts, stronger per FEA by 8%
• add WAGO mounting brackets for 24VDC and 120VAC into electrical box
• minor adjustments to all heat stake holes, should reduce oozing of plastic on install
• Z motors are now in the chamber of the machine, allowing 100mm shorter ballscrews
• Support for NEMA23s on Z removed, may return in a future release. Testing has deemed these unnecessary.

This will be the last alpha release, all future release 1 releases will be betas.

Masherbrum (K1) - Release 1 - Alpha 4

Changes from Alpha 3

• add emergency stop bed/gantry over travel stops under bed
• add Slice Engineering Mosquito Support
• add TL Dragon Support
• add Magnetic Coupled Z Probe with Dock
• Hotend bolts in from bottom instead of top, removal of extruder no longer required
• add hinges for front panel
• unify bed design with K2
• add thru bolts to XYZ towers to strengthen parts
• modify xy tool top plate to allow more clearance around fans when ascender is installed
• update pin definitions in config to be correct for SKR1.3

Masherbrum (K1) - Release 1 - Alpha 3

Changes from Alpha 2

• new panel clips for sides and back
• update skirts to match panel clips
• slots in the xy belt tensioning mechanism on the right side
• new filament switch mounting method
• duet3 support (no config, just brackets)

Masherbrum (K1) - Release 1 - Alpha 2

Changes from Alpha 1

• add blind joint holes (manually drill post purchase) for gantry tower posts (forgot to model)
• add template for said blind joint holes
• move z endstop and brush to front of bed
• alter foot mounting brackets to better work with K2 design. less material also

Masherbrum (K1) - Release 1 - Alpha 1

Masherbrum (K1) Printer

Project Masherbrum (K1 for short) is a Medium Format, Direct Drive, Fully Enclosed FDM Printer.

This is an entirely scratch design, based on the efforts of the "Hypercube Overkill Project" for the XY Motion System

Our discord server can be found here: https://discord.gg/MzTR3zE

BOM/Sourcing Guide for a 250x250x250 Build can be found here: https://docs.google.com/spreadsheets/d/1O3eyVuQ6M4F03MJSDs4Z71_XyNjXL5HFTZr1jsaAtRc/edit?usp=sharing

Frame Calculator: https://docs.google.com/spreadsheets/d/1OafYgwpRugKy69tp4yEFCRedxJVDkKtnEzjKQJuyjoY/edit?usp=sharing

The goals of this project are as follows:

• Fully Enclosed Design
• 2020 and 2040 Frame Members
• Insulated Build Chamber (Not Heated)
• Build Volumes of ~200^3 to 400^3 (use of whole plate available) + additional area to purge and wipe
• Direct Drive Extruder
• Shortest Belt Paths Possible, 4 Motors, 2 Per X, 2 Per Y Axis
• Moving Gantry, not Bed
• MGN9 Rails (Z Axis)
• MGN9 and MGN12 Rails (X, Y)
• 9mm Belts on XY, 1204 Ballscrews on Z to lift gantry
• Heavy Duty Bearings
• LDO Stepper Motors (Optional but Recommended)
• NEMA17 Motors XY, NEMA17 or NEMA23 Z
• Minimal Printed Parts (ABS Required, Filled Nylon Recommended)
• 32 bit controller standard (Dual SKRs)
• 24V Power Standard
• AC Heated Bed, 12mm MIC6 Plate with Magnetic Build Surface