annex-engineering / gasherbrum-k3

Open Air or Fully Enclosed, Small Format, Moving Bed, CartesianXY, FDM 3D Printer with Direct Drive Extrusion System

Gasherbrum (K3) Printer - Release 1.1

Project Gasherbrum (K3 for short) is a Small Format, Direct Drive, Fully Enclosed or Open Air FDM Printer.

This is an entirely scratch design, based on the efforts of the "Hypercube Overkill Project" for the XY Motion System, and inspired by all other prior repraps.

Our discord server can be found here:

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

Project Goals:

• Fully Enclosed Design or Open Air
• 2020 Frame Members
• Build Volume of ~180^3 mm
• Direct Drive Extruder (Sherpa Mini, Sherpa Micro, and Folded Ascender supported)
• Shortest Belt Paths Possible, 4 Motors, 2 Per X, 2 Per Y Axis
• Moving Bed
• MGN9C Rails (XYZ and Cross)
• 9mm Belts on XYZ
• Maxwell Coupling on Bed Frame
• NEMA17 Motors XYZ
• LDO Stepper Motors (Optional but Recommended)
• Minimal Printed Parts (ABS/ASA Required)
• 32 bit controller standard (Single Fysetc Spider, or Fysetc S6 with expander configurations provided, others at your own leasure) - Klipper Highly Recommended
• 24V Power Standard, 48V Power Optional via the ANNEX Constellation Series of Boards
• AC Heated Bed, MIC6 Plate with Magnetic Build Surface or Glass on Thermal Pads
• Supports many hotends

• Enclosed Printers are passively heated and only designed around an average 65C chamber temperature, K3 is not intended to be a High Temperature printer. It was designed to excell at common engineering materials such as PLA, PETG, ABS and some PC/Nylon Blends

Images

gasherbrum-k3's Issues

K3_Front_Door_Engrave_Standard.svg，This file seems incomplete?

K3_Front_Door_Engrave_Standard.svg，This file seems incomplete?

M6 Feet please?

I had to drill the feet out for my M6 2020 profiles. Can we please get a M6 variation of?
https://github.com/Annex-Engineering/Gasherbrum-K3/blob/main/STLs/Summit_Enclosure/%5Ba%5D_oring_foot_x4_rev1.STL

Bed frame mount recess for heated insert.

A nice-to-have for this mount bed_frame_mount_front would be to have a small recess to allow the heat-set insert to lay down in. And then you can insert a bolt from the back that screws into it cleanly.

Making it a bit easier to pull the heatset insert into the part. As you only have to heat it to pull it in.

File K3 - R1.1 - 2022-11-24.rar

Hi,

Is file K3 - R1.1 - 2022-11-24.rar broken? If you open the CAD, it is almost empty.

Custom silicone heater wires may interfere with purge bucket

With the current design, the wires on the custom silicone heater exit on the left side of the bed and may collide with the purge bucket unless they are bent at a sharp angle. Moving the wires to the right side of the bed (left side in the custom heater drawing) should solve this.

5x8x1 washers missing in sourcing guide

Hi,

The sourcing guide has yet to have 5x8x1 washers in it. A filter search of "Washer, 5x8x1" in the eDrawing shows 12 such washers common to both configurations, and 12 more for the belt-Z config.
None unique to the screw config.

I hope this is the right place to let the Annex team know!

Screw Z part in common folder

Hey guys,

Can you please move this file:
https://github.com/Annex-Engineering/Gasherbrum-K3/blob/main/STLs/3Z_Drive_Components/common_parts/safety_spring_mount_rear_x1_rev2.stl

To this folder?
https://github.com/Annex-Engineering/Gasherbrum-K3/tree/main/STLs/3Z_Drive_Components/tr12_screw_drive

It's for the screw z

STEP files for CAD

Is there a plan to release the CAD files in Step format or a format that is widely used?
It is a big letdown seeing x_t file format, I believe most of diy community uses step format which can be opened and edited in most of opensource CAD software.
Kindly consider this suggestion, If you really want the design to be mass adopted. Take the hint from Voron, I am not asking for detailed documentation just the CAD

CAD folder only has electronics box

Looking for a place I can see the entire build

Wrong pulley size in the manual

On the picture below, the pulley should be 6mm and not 9mm. It's wrong on all 3 Z steppers.

CAD release date

Hi Guys, loving building the printer so far, just waiting on the slow boat from China.

Any idea when the CAD for the printer will be released? I am quite keen to create a hotend mount for my orbiter straight from source if possible. Along with some minor tweaks to suite my needs.

Cheers

Humps that slot into alu extrusions do not match

The little humps that fit into the alu extrusion slots are wider than the rest of the K3 parts.
The following parts that I found have the wider hump:

• front_door_bearing_block_1_x2_rev1.STL
• front_door_bearing_block_2_x2_rev1.STL
• front_door_magnet_catch_x1_rev1.STL
  It would be great if you could make the hump of these parts smaller, e.g. make them the same as the rest of the parts.
  The smaller hump seems to work fine for all other K3 Parts and have the benefit that they also work for I type 5mm extrusion.

Potential R1.2 Z axis carriage mount changes

There are two potential issues with the current z axis carriage mounts that could be changed for the R1.2 release.

1. The rear z carriage mount has the tension slot shallower than the front mounts. The moving tensioner was made longer and the front parts were changed accordingly, but the rear was not.

The rear mount should be lengthened to match the front, otherwise the tensioner sticks out quite a bit.
I realize that if the rear stationary tensioner was taller you could no longer get the screw in for the bearing. Maybe there is no elegant solution for this.

2. The new counterbored holes on the front carriage mount have very thin geometry near the outter edge. This causes very thin webbing when printed which breaks off easily. The webbing could be removed and chamfered vertically to blend into the top and bottom.

Printed parts with webbing broken off and blended with a file:

XY Endstop(X Max) incorrect size in CAD

XY Endstop(X Max) screw shows "socket head cap screw_am(B18.3.1M - 3 x 0.5 x 45 Hex SHCS -- 18NHX)" but isn't this supposed to be m5x20mm?

K3 Y axis left and right endstops are functionally identical and can be merged

With the removal of the extra adjustment screw on the Y axis endstops in R1.2, the two parts are now identical except for the embossed text. The two parts could be merged into a single file with quantity 2 to reduce stl count.

Updated renders

Does someone mind updating the renders on the main README with Z belt drive versions?

Minor R1.2 STL issues

A couple of issues I've found while printing parts:

• [a]_xy_tensioner_moving_moar_grip_x8_rev1.stl indicates that 8 copies should be printed. However, now that [a]_z_tensioner_moving_moar_grip_x3_rev1.stl exists, there should only be 4 copies needed, or 5 for 1 extra.
• [a]_corner_motor_mount_2_piece_upper_x4_rev6.stl and corner_motor_mount_2_piece_upper_x4_rev4.stl share a name, despite serving entirely different functions.
• x_max_split_corner_endstop_x2_rev3.stl, y_min_left_split corner_endstop_x1_rev4.stl, and y_min_right_split corner_endstop_x1_rev4.stl appear to be oriented incorrectly.