Posts
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The smell and the filter media
The first research topic is what the smell is made of and what catches it.
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Research
Before I buy or model anything, I need to know what the filter is up against and what each part of it has to do.
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The plan
This is everything I think the project needs, in roughly the order I'll do it.
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The project
We have two cats, and they use the downstairs WC for their litter trays.
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Where it stands
Yesterday this was a portable monitor, a spare mini PC and a printer.
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Exports and assembly
The last step before printing was to get the design out of FreeCAD intact: a STEP file for every printed part, a STEP assembly for each variant with the monitor and the PC, and an assembly sequence.
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E4 Wall
The shared dock pays off here.
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Finishing the device
A stand that passes its checks is still a bracket until the cables, the desk contact and the airflow are dealt with.
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Printing and iterating
Every v3 part prints without supports, in black PLA Basic on the textured PEI plate.
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Three stands
Each stand is two parts: a 14 mm fin printed flat, and a foot printed flat.
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The hub
Mount option E had two problems as drawn.
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Stand v3: the hub and its stands
With the hub chosen (7.1), the workstation becomes two problems with one interface between them:
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Five options
All five pass the checks: one valid solid each, no overlap with the monitor or the PC, and each fits the A1.
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The v3 double mount
Stand v2 fixed the creep lever, but its PC sits high on the back of the screen.
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The self-restoring rule
Every stand so far tipped at a push of a few newtons.
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Rules for printed structure
The B2 review and the v2 design turned into a set of rules.
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Carrier, spine and foot
The monitor's inserts give 3.6 mm of thread (3.1).
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Stand v2: the PC behind the screen
The creep problem in B2 came from geometry: the support reached round the PC, so the screen hung on a long lever.
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What the checks missed
The renders of B2 showed z-fighting where the parts met: two surfaces flickering in the same place.
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Round 2: B1, B2 and B3
For round 2 I added a rule: the screen's bottom edge, the PC's front and the stand's front end on one line, with nothing further forward.