Annex K3

A fast 3D printer for high temperature materials (ASA, ABS, Nylon etc).

How to print

Power up the printer with the switch on the back, give it a couple minutes to boot; there should be a web UI at http://annex.local.

Before printing

Make sure the print bed is clean and there is a magnetic sheet on it. Do not let the mag sheet stick over the left edge and catch the purge bucket.

Hit "Home all" after turning it on; it should home X and Y, pick up the probe, boop the middle of the print bed and put it back.

If the bed has been messed with, also press "square bed to machine" for 3-point leveling; not needed for routine printing.

Turn on the filter fan ("Rebreather" to 100%) for better airflow in the chamber and more even heating.

Preheat the bed; use the Preheat function in right click menu for ASA/ABS or just type in desired temps. If you're not in a hurry, letting it sit for a half hour once at temperature levels out to minimize warping.

Slice your model, export and upload to the Klipper UI (presets linked below but need tuning as of right now).

Choose your g-code, hit print and enjoy the show. It's fast and fun to watch.

After printing

Let it sit for 30 minutes or so with the door closed and rebreather going to absorb fumes in the chamber and avoid a whiff of ABS nastiness when you open the door. Open the door and let the heatbed cool off, ideally the print should just pop off the bed on its own. If you are in a hurry, carefully remove the mag sheet from the bed (it's very hot!) and let it sit outside to cool faster. Do not try to pry the part off of a hot sheet, it'll stick and make a mess.

Specifications

Model: Annex K3 1.0

Controls: Klipper on RPi4, BTT Octopus Pro controller, 48V Trinamic stepper drivers

Hotend: Slice Mosquito Magnum, 50W heater, 500C max but not tested above 300C.

Nozzle: Bondtech CHT 0.4mm as of now (no abrasive materials with this nozzle please!)

Bed probe: microswitch on magnets (Annex Quickdraw)

Heated bed: 170x170mm MIC-6 aluminum plate, magnetically attached Prusa Mini steel sheets, Fabreeko 300W AC heater, 150C safety cutoff but please be careful going over 100C and do not leave the printer unattended.

Air filter: yes, Annex Rebreather with carbon grains (only use acid-free carbon, there is a bag in the parts box or it instantly rust!)

Filament Runout sensor: installed but not configured (volunteers welcome!)