Part Defects
Blow Out
10 min
blow out an unvented volume creates its own vent hole under the pressure differential how to identify blow out can be diagnosed as follows blow out is a defect specific to unvented volumes the hole will generally appear along a vacuum line , horizontal relative to the platform cause unvented volume unvented volume solution print preparation or part design cause unvented volume unvented volume solution print preparation or part design cause unvented volume unvented volume solution print preparation or part design troubleshooting verify if your project contains an unvented volume project analysis in the printer software will alert you if you have an unvented volume if you do have an unvented volume, proceed to the print preparation or part design adjustments troubleshooting options below if you do not have an unvented volume, refer to the identify a defect guide to identify a different defect it is recommended that you review all the possible solutions before taking action to ensure you are pursuing the best course of action print preparation or part design adjustments the following solutions will address print or part related causes of the defects choose among the suggested actions below and select the best approach for your application usually only one type of adjustment is needed orientation unvented volume reorient the part to vent the trapped volume (supports may also be needed) orientation unvented volume supports supports unvented volume lift the part above the platform on supports to vent the trapped volume use bar supports, or break up fence supports into shorter sections with gaps in between, to provide venting supports unvented volume design unvented volume add vent holes in the part, near the platform, to vent the trapped volume reference dls design guidelines for vent hole guidance design unvented volume print plan adjustments print plan adjustments are not applicable for this defect if problems persist, please reach out to carbon support explanation & causes explanation an dls printer dynamics has a pressure differential inside versus outside the trapped volume if an internal cavity cannot vent to the outside, the difference in pressure between the inner cavity and the outside of the part can cause the part to puncture, creating its own vent hole thin walls in conjunction with a large trapped volume are the most likely to experience a blow out more susceptible to unvented volumes epu due to its low green strength l1 printer due to larger suction forces causes print preparation or part design how the part is oriented , supported , or designed is causing the defect print preparation or part design cause root issue problem why defect presents unvented volume a hole in the part the pressure differential causes the part to puncture, creating its own vent hole