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| Cetus3D 3D Printer |
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| Bee:
I've not seen any further mention of the falling head problem. My understanding is that it starts at the bottom and then can only go up until finished so perhaps a pawl on the toothed belt would work, kind of inverse of the normal people lift safety catch. |
| awemawson:
Counterbalance spring on order :thumbup: There are all sorts of catches and ratchets that have been developed, but the balance spring is the most elegant in my view. Tracking says it's 'out for delivery' :clap: |
| awemawson:
Today I made a little box - nothing very exciting, but it was a Autodesk Fusion 360 learning exercise for me. I wanted to make a drawing where the walls and base of the box are a defined thickness, but the other dimensions can be stretched or shrunk - a sort of parametric model. In this case I just concentrated on the base, and it nicely stays at 3 mm thick as I stretch or shrink the height :thumbup: It has also proved to be a useful calibration check for X & Y accuracy, as the lid (a deliberately tight fit) fits just as well both ways round :ddb: Altogether a handy exercise. Printed in cheap eBay £10 / kg PLA filament, which is definitely not as strong as the stuff you get from e3d but about 1/3rd the price :bugeye: The Z axis spring balancer is slated to arrive tomorrow, so if it does I'll follow up with a few pictures |
| awemawson:
The Cetus3D has an inherent problem, in that when the power is turned off, the Z axis rail having little friction allows the Y motor and assembly to come crashing down onto the bed if you don't remember to hold it :bugeye: Several people have devised different solutions but I decided to use one based on a counter balance reel sping as it seemed a neat idea. No point in re-inventing the wheel so I ordered a kit. As promised today Steve the Post Man brought the Z Balancer modification kit. This is a kit put together by an enterprising user in the USA who solved the problem on his Cetus3D by finding a suitably small coiled wire spring balancer (rated at 2 lbs) to just give the assembly neutral buoyancy and drawing up and printing some bits to allow it to fit on the upright extrusion and take the weight of the Y axis and motor in the Z plane. Fitting was pretty straight forward - slightly unnerving screwing self tapping screws into the printed bit of the Cetus, but all went well (apart from the inevitable disappearing screw :bang:) Works well and to prove that it doesn't inhibit anything else the machine is currently churning out another box :thumbup: |
| PekkaNF:
--- Quote from: awemawson on May 22, 2017, 03:12:16 PM ---... it was a Autodesk Fusion 360 learning exercise for me.... --- End quote --- You got new laptop? My old laptop is a bit marginal to Fusion, there is one local shop that sells used used business laptops. They promised to message in few days if they have anything suitable under 400€. Free cad does not turn out free. Pekka |
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