Evolution of the Snowman - Inefficient Extrusion?
Posted by EP1
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Evolution of the Snowman - Inefficient Extrusion? April 09, 2014 02:01PM |
Registered: 10 years ago Posts: 11 |
Hi All,
Just a quick query. After following the advice from multiple threads here we've finally managed to correct a a few bottlenecks on our Ormerod.
As can be seen in the figure attached our snowman prints are evolving somewhat, the first (seemingly most solid) print warped due to not clamping the glass bed, the middle and far right print was following retightening of the hotend (extra nut added between heat sink and heating block), bed compensation by hand (using longer capheads as suggested by RepRapPro). We're wondering if the failed infill in the middle and far right prints is due to inefficient extrusion. Note, the extrusion rate was set as suggested by the AxisCompensation documentation.
A quick query is should the nut on the extruder (see second image) be moving as the stepper moves? i.e. does it move with the bolt?
Will this account for the failed prints?
Advice?
Just a quick query. After following the advice from multiple threads here we've finally managed to correct a a few bottlenecks on our Ormerod.
As can be seen in the figure attached our snowman prints are evolving somewhat, the first (seemingly most solid) print warped due to not clamping the glass bed, the middle and far right print was following retightening of the hotend (extra nut added between heat sink and heating block), bed compensation by hand (using longer capheads as suggested by RepRapPro). We're wondering if the failed infill in the middle and far right prints is due to inefficient extrusion. Note, the extrusion rate was set as suggested by the AxisCompensation documentation.
A quick query is should the nut on the extruder (see second image) be moving as the stepper moves? i.e. does it move with the bolt?
Will this account for the failed prints?
Advice?
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Re: Evolution of the Snowman - Inefficient Extrusion? April 09, 2014 02:11PM |
Registered: 10 years ago Posts: 14,672 |
Yes the nut should move with the gear.
Why did you add an extra nut between the heated block and the heat sink? You shouldn't need that, and if it is touching both then it will increase heat conduction between the heatsink block and the heatsink - which is a bad thing.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Why did you add an extra nut between the heated block and the heat sink? You shouldn't need that, and if it is touching both then it will increase heat conduction between the heatsink block and the heatsink - which is a bad thing.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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Re: Evolution of the Snowman - Inefficient Extrusion? April 09, 2014 02:27PM |
Registered: 10 years ago Posts: 11 |
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Re: Evolution of the Snowman - Inefficient Extrusion? April 09, 2014 03:13PM |
Registered: 10 years ago Posts: 14,672 |
You shouldn't need that extra nut if you have done up the hot end nozzle and associated parts tight enough. The top end of the nozzle must be kept cool (that is what the heatsink and fan are mostly for) to prevent the filament from melting too far up the nozzle, and a nut between the two aluminium blocks may cause a problem by transmitting more heat than the heatsink can carry away.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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