Vacuum Line

vacuum line an unvented volume creates lines on a surface by moving thin walls under the pressure differential how to identify vacuum lines can be diagnosed as follows vacuum lines are a defect specific to unvented volumes the line(s) appear horizontal relative to the platform thin walls are most likely to present this defect the walls will appear to be pulled in towards the trapped volume along the vacuum line when the geometry transitions from a thin wall to a large cross section surrounding an unvented volume, a cross section line docid 7tykefaqk6hnwmvjvw6xj can occur in conjunction with the vacuum line docid\ uia3vrtjsnoqvyxwl8vxs defect both defects may need to be addressed in extreme conditions, the blow out docid\ ygabvqomutwyuvdovnbfn defect may also occur along vacuum lines cause unvented volume unvented volume solution print preparation or part design the upper line is occurring in conjunction with a cross section line defect the lower lines are vacuum lines only cause unvented volume unvented volume solution print preparation or part design the upper line is occurring in conjunction with a cross section line defect the lower lines are vacuum lines only cause unvented volume unvented volume solution print preparation or part design the blow out defect is also occurring in this example troubleshooting it is recommended that you review all the possible solutions before taking action to ensure you are pursuing the best course of action if the best course of action is not apparent, try the troubleshooting options in the order listed refer part defects for more tips verify if your project contains an unvented volume project analysis docid\ gfr goc irq l9 kanc x 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 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) 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 design unvented volume add vent holes in the part, at or near the platform, to vent the trapped volume reference dls design guidelines docid\ t94pr a c0pihy6ljswk7 for drain/vent hole guidelines print plan adjustments print plan adjustments docid\ nxuk0dltz vemeau0dipn are not applicable for this defect if problems persist, please reach out to carbon support mailto\ support\@carbon3d com explanation & causes explanation an dls printer dynamics docid\ u7xyytjydp3bvsyy2qkcu has a pressure differential inside versus outside the trapped volume the walls surrounding the trapped volume will be pulled inwards by the low pressure as the platform moves up during pumping, causing wall deformation some of the pressure may relax as the platform pumps back down to the curing position, thus the walls continue to deform as the print progresses often resulting in more than one vacuum line as the print proceeds reference dls printer dynamics docid\ u7xyytjydp3bvsyy2qkcu for more information on pumping up and down during printing thin walls in conjunction with a large trapped volume are the most likely to experience vacuum lines 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 horizontal line along the part the pressure differential causes the walls surrounding an unvented volume to move while the platform moves up and down during printing