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Homebrew engraver to 3D printer Mod
BillTodd:
It's just completed 18 hours of printing with the bed heater disconnected ,so at least iknow the problem is caused by the heater.
AdeV:
Almost ready for a run on compressed air then! :lol: Although that yellow is a touch bright to pass off as brass :scratch:
Regarding the heater - the earth thing sounds like a good call; I guess the heater is thermostatically controlled on/off? Maybe when it clicks on, the current draw is occasionally enough to crash the computer... in which case, a honking great capacitor (maybe a few hundred micro Farads) across the controller's power rails would be enough to fix it.
If the heater isn't thermostatic.... back to the ole' drawing board?
BillTodd:
heaters are software pid using mosfet switches . It seems to handle full load during initial warm up so it's not as simple as voltage drop .
I'll see if i can find time tomorrow (got my head stuck in a book this evening and now , suddenly, it's bedtime!)
One thing I discovered this morning : it is possible to refom the plastic without melting it (sort of like ironing a shirt ) using a temp controlled soldering iron at 190°C or so. Enables nice smooth holes and curves.
BillTodd:
Well cross fingers the extra ground wire seems to have worked.
I ran a new wire from the psu 0v to the outside of a coax power plug that connects to the arduino board .
While perusing youtube last night I found a chap talking about cooling fans for the work piece and how it improves the print. I played around with this today (while waiting, fruitlessly for E.on to fit new smart meters) , and boy! does it make a difference. just waving a small fan at the test cube straightened up the sides .
Bouyed on by this I designed and printed a fan adapter , and now I have a cube that is 20.33 x 20.42 x 20.02 with beautiful straight sides .
Im not sure if I can just adjust the X&Y steps per unit or whether there is a better/correct way to tweak it to size ??????
Bill
Pete49:
Nice work Bill. I'm doing a conversion too (as if I don't have enough already) 3D printer to laser engraver as I have a spare no name one to play with. I've ordered a 500 mililwatt laser so in the meantime I looking at YouTube for inspiration.
Pete
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