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Created 2022-02-27
Construction
I'm currently babysitting a 3d printer, it's a "GEETech i3 Pro C" - apparently.
The end goal is to make the Penkesu Computer, but first I need to get the printer working as well as possible so I can print the case.
It's a fairly basic device from what I understand, manual bed levelling for example, but has a heated bed and two extruders. Aligning the nozzles for these to be exactly the same height off the bed is ... not fun.
After quite a few small burns (and one that really hurt and still hurt after 4 hours under water) I think I'm finally getting it dialled in to work well with both extruders simultaneously.
This is the latest "XYZ calibration cube" printed with extruder 0 (purple) for the perimeters, and extruder 1 (yellow) for the infill.
The slicer preview looks like this
The resulting cube looks like this
Photos of all the sides are at the end of the page, if you care or want to help me improve the results!
I think I'm trying to do something quite hard here, use both extruders on every layer, but I really want to have my computer case have purple edges and yellow middle, because if I'm making it as a one off just for myself why shouldn't I have it look how I want? Other than that being hard.
To answer the inevitable "yeah, but can it even print with just one extruder anyway?" - Yes, it can. These two cubes were printed with exactly the same settings but using only one extruder, the purple loaded into extruder 0 and yellow into extruder 1. The only difference is that I grabbed a nearby fan to aid general cooling for the yellow cube as the purple one had droopy soft warm infill.
I'm using "PrusaSlicer" with the following changes to the default printer configuration - using "expert" mode because that is required to unlock multiple extruders.
Capabilities - Extruders - 2
Extra length on restart - 0.1mm (ensures the extruder is extruding when it re-starts on the next layer)
Retraction when tool is disabled - 15mm, 0.2mm extra on restart (ensures the extruder is extruding when it re-starts on the next layer)
Extruder offset - x: 33mm, y: 0.5mm (because the firmware doesn't handle this)
Extra length on restart - 0.1mm
Retraction when tool is disabled - 15mm, 0.3mm extra on restart
I find these (nominally per print) settings essential too
Vertical Shells - Perimeters - at least 3 (to prime the extruder before it starts the first layer)
Quality - Avoid crossing perimeters - enabled (avoid ooze from the nozzles being dragged onto the model)
Fill pattern - Gyroid
Top/Bottom fill pattern - Octagram Spiral
Loops (minimum) - 6 (primes **both** extruders before they start working on the first layer)
Perimeter extruder - 1
Infill and Solid infill extruder - 2
Every side of the cube, if you like that sort of thing.
Base (opposite Z) of the cube, a star pattern is visible in yellow with some gaps and splodges [IMG]
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