Fringing

fringing resin is still moving when curing, resulting in excess partially cured resin on the surface or outer edges of the part how to identify fringing can be diagnosed as follows after printing the excess partially cured resin on the part may appear wet & shiny like liquid resin, but it will not wash off the surface, even with manual touch up on surfaces excess resin sits proud of the correct surface the texture may appear fuzzy, bumpy, and/or shiny the texture will run horizontally relative to the build platform the texture will run around the entire perimeter of the part on edges fringing on edges usually occurs at the base of the part (at the platform), especially at large cross sections on the exterior edges of a base, fringing will appear jagged flashing is a defect that may appear similar but will be smooth instead of jagged where a lattice connects to a base, the lattice struts will appear disconnected to the base cause unvented volume unvented volume solution print preparation or part design fringing on surface cause unvented volume unvented volume solution print preparation or part design fringing on surface cause unvented volume unvented volume solution print preparation or part design fringing on surface cause unvented volume unvented volume solution print preparation or part design fringing on surface cause unvented volume unvented volume solution print preparation or part design fringing on surface cause large cross section large cross section solution print preparation or part design fringing on surface cause inconclusive fringing at base edge cause inconclusive fringing at lattice strut connected to base cause inconclusive fringing at lattice strut connected to base 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 process, material, and hardware checks if any of these conditions apply to your print, take the corrective action and reprint to see if the problem is resolved resin ensure that the resin selected matched the printed resin resin unvented volume 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 unvented volume 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) large cross section change the orientation for a smaller cross section in the print 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, near the platform, to vent the trapped volume reference dls design guidelines for vent hole guidance design print plan adjustments reference print plan adjustments for guidance on the following parameters 4 settle down parameters delay timing parameters minimum pre exposure delay minimum time force slope down settled if problems persist, please reach out to carbon support explanation & causes explanation fringing occurs when resin is still moving when the uv light begins to cure the slice resin can be continuing to flow for a couple reasons there simply has not been enough time in the settle down stage of printing for the resin to stop moving this can be due to a mis selected resin, large cross section, or a print that has been sped up too much an dls printer dynamics can cause the resin to flow abnormally from the pressure differential inside versus outside the trapped volume, and in some cases, the walls of the part itself are moving under the pressure of the unvented volume 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 large cross section fringing occurs on the surface around a large cross section the resin needs more time to flow across larger cross sections large cross section fringing occurs on the edges of a base the resin needs more time to flow across larger cross sections large cross section a lattice appears disconnected from a base the resin effectively did not fully cure as it was still moving along the base, appearing as though the struts did not fully connect unvented volume fringing occurs on the surface around an unvented volume resin is still moving from the pressure differential, which can even make the walls of the unvented move in extreme cases resin the printing material is expired , beyond the printing range in its pot life , or has been improperly mixed , causing abnormalities in the print resin root issue problem why defect presents incorrect resin the resin selected in the project was not the same as the resin printed the print plan determines how long the settle down phase will last, and the resin is one of the factors in that determination if the wrong resin is selected or printed, then the print plan may not have the timing right print plan adjustments print plan adjustments print plan adjustments adjust the print plan to optimize mid to high volume production and/or address part defects in doing so, adjustment may both prevent or cause defects below are adjustments that can cause this defect printing stage parameter type type of adjustment why defect presents 4 settle down delay timing decrease decrease the resin needs more time to stop flowing