1 |
line construction
- lines break / loosen
-
guests / guides get tangled → risk of injury (stumbling, pinching off; possibly burning at the hot end
-
construction is badly damaged
|
10 |
3 |
30 |
- suitable shut-off of the device operation / entering the construction only by trained personnel
- check deflection pulleys, check parts for sharp edges or generally mechanical contact points for abrasion
- check lines knots → do not use simple knots; use special knots
- use of tear-resistant lines (special fishing line with sufficient traction and diameter)
- occasional inspection / maintenance (protocol)
|
2 |
parts of the machine fall off
- e.g. screws or plastic parts
- visitors could get hurt
- machine could be damaged (malfunction)
|
8 |
2 |
16 |
- secure screws with screw locks or use stop nuts
-
check the connection stability in an acceptance report
-
occasional inspection / maintenance (protocol)
-
produce parts from elastic material (tendency to brittle fracture / prevent cracks) → use a high degree of infill
|
3 |
hotend or extruder smokes or burns
- device destruction
- smoke detectors and sprinkler systems damage the exhibition
- filament / substrate is set on fire
|
10 |
1 |
10 |
- redundant thermal sensor
- recent firmware with temperature jump measurement, watchdog and automatic emergency shutdown
- safe installation of the sensors (gluing / screwing)
- regular inspection / maintenance (protocol)
- consequences when entering are destructive
|
4 |
controller parts smokes or burns
- device destruction
- smoke detectors and sprinkler systems damage the exhibition
|
10 |
1 |
10 |
- electrical inspection / acceptance with detailed protocol
- buy high quality electronics
- use high quality wiring / cabling and shielding (generous cross-sections, good manufacturers)
- consequences when entering are destructive
|
5 |
Software
- print does not start
- print result does not match the input
|
3 |
3 |
9 |
- extensive testing and logging / documentation
- establish remote maintenance routines
|
6 |
collisions between printed part and lines
- design-related variability of the possible pressure dimensions depending on height Z
- The machine could tangle and damage itself
|
8 |
1 |
8 |
- simulation of the model to be printed with the appropriate software
|
7 |
errors in print part - vibrations during printing
- by heavy trucks driving next to the building
- by wobbling on the frame by guests / visitors
|
3 |
2 |
6 |
- store the machine on a tight (spring) frame
-
situate warning panels with information like "Do not touch.", Print may loose traction." or similar
-
select the line diameter so that the installation becomes stable against stretching
|
8 |
material loss - tool oozes
- material spills uncontrollably on the printing platform or at other points in the effective radius of the machine
- due to insufficient screwing between the hot end heating block and the nozzle (thermal transition zone)
|
3 |
2 |
6 |
- check for tightness of the strand components and note them in the acceptance report
- regular inspection / maintenance (protocol)
- no further countermeasures possible (cannot be checked - only optically)
|
9 |
material does not stick → " spaghetti salad"
- at the start of printing
- during printing
- leads to wasted material
|
3 |
2 |
6 |
- regular cleaning of the printing surface
-
check the distance between the platform and nozzle
-
check the overhang angle in the print model and calculated support structures
-
checking the printing parameters (layer height, extruded volume per unit of time, etc.)
-
establish stability in the printing frame (no accidental offsets by warping the machine frame → thus offset in the printing part)
|
10 |
material extrusion fails
|
2 |
2 |
4 |
- kink protection for filament (filament guide → PTFE)
- check for blockages in the hotend
|
